update

The update command deploys any changes that are in the changelog file and that have not been deployed to your database yet.

Uses

The update command is typically used to apply database changes that are specified in the changelog file to your database.

When you run the update command, Liquibase sequentially reads changesets in the changelog file, then it compares the unique identifiers of id, author, and path to filename to the values stored in the DATABASECHANGELOG table.

  • If the unique identifiers do not exist, Liquibase will apply the changeset to the database.
  • If the unique identifiers exist, the MD5Sum of the changeset is compared to the one in the database.
  • If they are different, Liquibase will produce an error message that someone has changed it unexpectedly. However, if the status of the runOnChange or runAlways changeset attribute is set to TRUE, Liquibase will re-apply the changeset.

Running the update command

To run the update command, specify the driver, classpath, and URL in the Liquibase properties file. For more information, see Specifying Properties in a Connection Profile. You can also specify these properties in your command line.

Then run the update command:

liquibase --changelog-file=dbchangelog.xml update

Note: Enter the name of the changelog you want to use in place of dbchangelog.xml.

update global attributes

Attributes Definition Requirement
--changelog-file Specifies the root changelog Required
--url Specifies the JDBC database connection URL Required
--username* Specifies the database username Required
--password* Specifies the database password Required
--liquibaseSchemaName Specifies in what schema the Liquibase DATABASECHANGELOG and DATABASECHANGELOGLOCK tables will be managed Optional
--liquibaseCatalogName For MSSQL only: Specifies in what catalog the Liquibase DATABASECHANGELOG and DATABASECHANGELOGLOCK tables will be managed Optional

Note: The username and password attributes are not required for connections and systems which use alternate means of authentication.

update command attributes

Attributes Definition Requirement
--labels Tags you can add to changesets to determine which changesets in the changelog to evaluate based on their labels Optional
--contexts Expressions you can add to changesets to determine which changesets in the changelog to evaluate based on their contexts Optional 

						Liquibase Version: 4.9.1
						Liquibase Community 4.9.1 by Liquibase
						Running Changeset: example-changelog.sql::1::your.name
						Running Changeset: example-changelog.sql::2::your.name
						Running Changeset: example-changelog.sql::3::other.dev

						----------------------------------------------------------------------
						View a report of this operation at https://hub.liquibase.com/r/PjrHucIgg3
						* IMPORTANT: New users of Hub first need to Sign In to your account
						with the one-time password sent to your email, which also serves as
						your username.
						----------------------------------------------------------------------

				Liquibase command 'update' was executed successfully.